<template>

  <view>
    <!-- 使用自定义组件 -->
    <my-search @click="gotoSearch()"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i===active? 'active':'']" @click="activeChange(i)" @longpress="activeChange(i)">{{item.cat_name}}
          </view>
        </block>
      </scroll-view>

      <!-- 右侧滑动区 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <!-- 二级分类 -->
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title" v-if="active!==28">/{{item2.cat_name}}/</view>
          <!-- 当前二级分类下的三级分类列表 -->
          <!-- :url="'/subpkg/goods_list/goods_list?cat_id='+item3.cat_id"  -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>

      </scroll-view>

    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        //  二级分类列表
        cateLevel2: [],
        scrollTop:0
      }
    },
    onLoad() {
      this.wh = uni.getSystemInfoSync().windowHeight-50
      this.getCateList()

    },
    methods: {
      // 获取分类列表的数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message

        //  二级分类赋值
        this.cateLevel2 = res.message[0].children
        console.log(this.cateList);

      },
      activeChange(i) {
        this.active = i
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop= this.scrollTop===0? -1:0 
      },
      gotoGoodList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cat_id='+item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
        console.log('点击了my-search');
      }
    },


  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      border-right: 1px solid #f7f7f7;
      width: 120px;

      .left-scroll-view-item {
        background-color: #fff;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        &:hover{
          background-color: #f7f7f7;
        }
        &.active {
          position: relative;
          font-size: 15px;
          background-color: #f7f7f7;

          &::before {
            position: absolute;
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            top: 50%;
            left: 0;
            // 回退自己的50%
            transform: translateY(-50%);
          }
        }
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    // 指的是子元素一行盛不下，允许换行
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column; //  子元素纵向排列
      justify-content: center; //  居中排列 
      align-items: center; //  子元素x方向上居中
      padding: 10px 0 ;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>